X-ray system



.H. F. WAITE.

X-RAY SYSTEM.

APPLICATION FILED OCT. 6. 1917.

Patented June 15, 1920.

UNITED STATES PATENT OFFICE.

HARRY F. WAITE, on NEW YORK, N.- Y.

x-RaY SYSTEM.

Specification of Letters Patent.

Application filed October 6, 1917. Serial No. 195,013.

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' Be it known that I HARRY F. VVAITE, a citizen of the-United states, and a resident of Whitestone Landing, county of Queens, city and State of New York, have invented a new and useful Improvement in X-Ray Systems, of which the following is a specification.

The object of my invention is to provide a system of this class in which an X-ray tube with a hot cathode filament is heated from the same secondary winding, or other Winding adjacent thereto, of a transformer that suppliesthis tube with its X-ray generating current so that both the heating current and the X-ray generating current are generated by the magnetic flux which is generated by the primary of this transformer. This and 7 other objects are accomplished by my inven-- tion, one embodiment of which is hereinafter more particularly set forth.

-For a more particular description of my invention, reference is to be had to the accompanying drawings in which is shown a diagram of my improved system.

My improved system 1 is provided with any suitable source of electricity, as an alternating current generator 2 from which run conductors 3 and 4 to the primary 5 of a. transformer 6. The secondary 7 of th1s transformer has a few turns of a compara tively heavy wire for generating a current of low voltage and of sufficient power to properly heat an incandescent cathode fila ment 9 of an X-ray tube 10 to which it. is connected by conductors 11 and 12. This tube 10 has a very perfect vacuum such as is found in X-ray tubes with a hot cathode wherein the atmosphere of the tube is not used for X-ray generation. As the anode 13 of this tube 10 is connected to the other end of the. secondary 7 by means of a conductor 14 so that the X-ray generating current passes from the secondary 7 to the conductor 14 and then through tube 10 and the conductor 11 to the secondary 7.

In view of the foregoing the operation of my improved system will readily be understood. An alternating current is generated in the second ry 7 in the conventional man-' ner. One ciirrent heats the filament 9 through the conductors 11 and 12 and another current passes through the conductors 11 and 14 and generates the desired 'X-rays in the tube 10. As this tube has a high vacuum, it acts as a valve and so prevents all undesirable inverse currents.

While I have shown and described one embodiment of my invention, it is obvious that it is not restricted thereto but is broad enough to cover all structures that come within the scope of the annexed claim.

What I claim is: An X-ray system composed of an X-ray tube with a hot cathode and an anode,- a transformer unit with a single primary and a secondary composed of twosections, one having a few turns of coarse wire suitable for the cathode heating current, and the.

otherhavi'ng many turns of fine Wire suitable for the X-raygenerating current, three 1 wires connecting the X-ray tube and the secondary, two ofv which connect the coarse wire with the hot cathode and one of which connects the fine wire with the anode, and means for supplying the primary with a suitable electric current.

In testimony whereof I have hereunto set my hand this 29thday of September, 1917.

F. WATT 

